Police Officer Shot Dead at MIT

Violence reported in the community. Community urged to stay indoors.

A police officer for the Massachusetts Institute of Technology was shot to death on Thursday night at the school's Cambridge campus, touching off a manhunt for a suspect or suspects in a community on edge just days after the Boston Marathon bombing.

MIT police were sweeping the campus early on Friday, according to a campus alert. Massachusetts State Police and Cambridge police said they were assisting in the investigation.

David Procopio, a spokesman for the Massachusetts State Police, said the motive for the shooting was not known and the investigation would be led by the Middlesex County District Attorney's Office after the death of the officer.